2000 GMC 4.8L Codes PO300 & PO351,2,3,4,5,6,7,8!!!!
New here, Hi to all. I've replaced the following with no luck.....coils, wires, plugs, fuel pressure regulator. Fuel pump press at the sending unit is 60+ lbs. Don't have a tester for the fuel rail yet. Motor starts right up but has a miss, checked all plugs with a ign tester, all fire the same. Sprayed ether on the intake manifold....no change. EGR seems to be free. Unplugged MAF.no chqange. Seafoam in tank...nothing either. Any ideas?? Thanks in advance, Mitch.